Groundwater flow through hard rocks:

With dominant secondary porosity and permeability and characterized by anisotropies and extreme heterogeneities, whether the deduction of REV for a hard rock aquifer would remain practically feasible that will probably pave way for determining the resultant groundwater flow direction along with the measurement of aquifer hydraulic properties and its associated understanding of rock-water chemistry?

How easy is to ensure the hydraulic-connectivity (or continuous leakage) between weathered and fractured layers in a hard rock aquifer?

Any feasibility of catchment boundaries coinciding with groundwater divides in a hard rock aquifer?

If we have challenges in deducing meaningful and manageable definitions, then, will it be feasible to correlate scale-dependent heterogeneity and REV - while characterizing groundwater flow through hard rocks?

How about the effect of climate change and long-term drought on groundwater resources - towards handling water management issues associated with a hard rock (aquifer) region?

Will it remain feasible to assess the local water supply system associated with a hard rock (aquifer) region given the changes in annual temperature and precipitation patterns with isolated pockets of (local) elevated temperatures?

Whether the elevated surface evaporations (by few mm) from rising temperatures could alter the seasonal distribution of rainfall; and in turn, will further bring down K, T & Sy/Ss – in a hard rock (aquifer) region?